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Leases Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease cost	$ 35	$ 36	$ 40
Short-term lease cost	1	0	0
Variable lease cost	1	(2)	0
Sublease income	(3)	(4)	(4)
Total lease costs included in insurance operating costs and other expenses	$ 34	$ 30	$ 36

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

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-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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Period Type:	duration

X

- References

No definition available.

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X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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-Topic 842
-SubTopic 20
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-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

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-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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Period Type:	duration

X

- Definition

Amount of short-term lease cost, excluding expense for lease with term of one month or less.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
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-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

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X

- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

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-Topic 842
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-Section 55
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-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

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X

- Definition

Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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